Founds this on the site, hope it helps narrow down the problems for yea

"The P0113 code means your Intake Air Temperature (IAT) sensor is sending a voltage signal back to the PCM that is too high (over 4.6 volts)

As noted, the IAT is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and increases as the temperature decreases, (proportionally in each case). This varying resistance affects the voltage drop across the sensor terminals, which allows for a voltage signal to be sent back to the PCM corresponding to temperature.

The voltage signal that is sent back to the PCM is equal to the Reference Voltage (VRef, 5 volts) minus the aforementioned voltage drop across the fixed resistor. That is why an open in the circuit between the PCM and the IAT will result in "too high" voltage signal at the PCM (i.e., 5 volts). In addition, corrosion in the circuit would tend to add resistance and hence result in higher-than-normal voltage at the PCM because of the signal being based on voltage drop.

In any case, if the circuit checks out OK, then it's either the IAT sensor at fault, or the PCM."